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Finding the Fourth Proportional to 1,170.54, 1,752.75 and 861.93

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Solution

The fourth proportional to 1,170.54, 1,752.75 and 861.93 is: 1,290.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.54 : 1,752.75 = 861.93 : x
  2. Step 2: Convert to fraction form
    1,170.54/1,752.75 = 861.93/x
  3. Step 3: Cross multiply
    1,170.54x = 1,752.75 × 861.93
  4. Step 4: Simplify right side
    1,170.54x = 1,510,747.81
  5. Step 5: Solve for x
    x = 1,510,747.81/1,170.54
  6. Step 6: Final answer
    x = 1,290.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.